1100213121 has 24 divisors (see below), whose sum is σ = 1711450080. Its totient is φ = 626852352.

The previous prime is 1100213017. The next prime is 1100213129. The reversal of 1100213121 is 1213120011.

It is not a de Polignac number, because 1100213121 - 2⁹ = 1100212609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100213097 and 1100213106.

It is not an unprimeable number, because it can be changed into a prime (1100213129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40225 + ... + 61793.

It is an arithmetic number, because the mean of its divisors is an integer number (71310420).

Almost surely, 2^1100213121 is an apocalyptic number.

It is an amenable number.

1100213121 is a deficient number, since it is larger than the sum of its proper divisors (611236959).

1100213121 is a wasteful number, since it uses less digits than its factorization.

1100213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21933 (or 21926 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1100213121 is about 33169.4606679096. The cubic root of 1100213121 is about 1032.3467779909.

Adding to 1100213121 its reverse (1213120011), we get a palindrome (2313333132).

The spelling of 1100213121 in words is "one billion, one hundred million, two hundred thirteen thousand, one hundred twenty-one".